(57) A cylindrical lock comprises a plug (12) rotatable within its bore and having a keyway
(14) for reception of a key (2) having a shank (4) formed with a longitudinally-extending
groove (7) of special configuration, and a line of pins (20, 30) carried by the plug
and movable transversely along a line eccentric thereto. Each of the pins is formed
with a notch (23) which are all alignable when the pins are moved to their unlocking
positions by the key. The plug further includes an elongated locking pin (44, 46)
normally seated within axially-extending grooves (28, 38, 40, 42) of the plug and
housing (10) such as to lock the plug against rotation within the housing, but when
all the notches of the pin are axially aligned by a proper key, the locking pin unseats
from the axially-extending groove of the housing to free the plug for rotation within
the housing.
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